I disagree on the slam you are giving ball links. I use them all the time and find them much more reliable than clevises. I have them on some 1/4 scale planes I have been flying for over 10 years, one with a Quadra 72 on it. I use them on elevator and rudder as they are more precise than horns and clevises and have much less friction and end play. As with most things, there are quality parts and cheap parts. If you buy the quality parts like DuBro or other name brands, they are more reliable than clevises. In places where there is a slight offset or twisting motion when throws are great, they are superb.